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Preparation method of lanthanum hexaboride-molybdenum disilicide-silicon carbide thermal shock resistant coating

A technology of molybdenum disilicide and lanthanum hexaboride is applied in the field of chemical material preparation, which can solve the problems of thermal expansion and mismatch of failed coatings, and achieve the effect of excellent thermal shock resistance.

Active Publication Date: 2014-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can overcome existing in the prior art, MoSi 2 - Failure of SiC coating samples in thermal shock experiments and LaB 6 Coating Thermal Expansion Mismatch Problem

Method used

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  • Preparation method of lanthanum hexaboride-molybdenum disilicide-silicon carbide thermal shock resistant coating
  • Preparation method of lanthanum hexaboride-molybdenum disilicide-silicon carbide thermal shock resistant coating

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Experimental program
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Effect test

Embodiment 1

[0029] This embodiment is a kind of carbon / carbon composite material LaB 6 -MoSi 2 - SiC coating, including inner and outer coatings. The inner coating is SiC, the outer layer is LaB 6 -MoSi 2 Coating, the preparation raw material includes 20~30wt.%MoSi 2 , 50~65wt.%Si, 5~20wt.%C and 0~10wt.%LaB 6 . The components of the outer coating penetrate fully into the porous inner coating, and there is no obvious interface between the inner and outer coatings.

[0030] Preparation of carbon / carbon composite LaB 6 -MoSi 2 - SiC coating or MoSi 2 -The specific process of SiC coating is:

[0031] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0032] Step 2, preparing the SiC i...

Embodiment 2

[0044] This embodiment is a kind of carbon / carbon composite material LaB 6 -MoSi 2 - SiC coating, including inner and outer coatings. The inner coating is SiC, the outer layer is LaB 6 -MoSi 2 Coating, the preparation raw material includes 20~30wt.%MoSi 2 , 50~65wt.%Si, 5~20wt.%C and 0~10wt.%LaB 6 . The components of the outer coating penetrate fully into the porous inner coating, and there is no obvious interface between the inner and outer coatings.

[0045] Preparation of carbon / carbon composite LaB 6 -MoSi 2 - SiC coating or MoSi 2 -The specific process of SiC coating preparation is:

[0046] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0047] Step 2, prepari...

Embodiment 3

[0059] This embodiment is a kind of carbon / carbon composite material LaB 6 -MoSi 2 - SiC coating, including inner and outer coatings. The inner coating is SiC, the outer layer is LaB 6 -MoSi 2Coating, the preparation raw material includes 20~30wt.% MoSi 2 , 50~65wt.%Si, 5~20wt.%C and 0~10wt.%LaB 6 . The components of the outer coating penetrate fully into the porous inner coating, and there is no obvious interface between the inner and outer coatings.

[0060] Preparation of carbon / carbon composite LaB 6 -MoSi 2 - SiC coating or MoSi 2 -The specific process of the preparation method of SiC coating is:

[0061] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0062] S...

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Abstract

The present invention relates to a preparation method of a lanthanum hexaboride-molybdenum disilicide-silicon carbide thermal shock resistant coating. The method comprises the following steps: drying a 2D C / C composite material for standby; preparing a SiC internal coating by a liquid silicon infiltration method; carrying out ball milling and mixing on MoSi2, Si, C and LaB6 according to a certain proportion; and preparing a LaB6-MoSi2 outer coating by using an embedding technology. According to the invention, the LaB6 can refine MoSi2 grains, promote sintering of a MoSi2 ceramic coating, improve the penetration ability of coating components, enable LaB6 and MoSi2 to uniformly and effectively penetrate into the porous SiC internal coating, so as to form a dense continuous coating structure. The coating provided by the invention has a simple preparation method, and more excellent thermal shock resistance compared with a non-modified MoSi2-SiC coating.

Description

technical field [0001] The invention relates to a method for preparing chemical materials, in particular to a method for preparing a lanthanum hexaboride-molybdenum disilicide-silicon carbide anti-thermal shock coating suitable for carbon / carbon (C / C) composite materials. Background technique [0002] C / C composite material is currently the only structural material that can be used above 1650°C, and it has been widely used in defense and civilian fields such as aviation and aerospace. However, C / C composite materials are easily oxidized in high-temperature aerobic environment, which is the bottleneck problem of their application in high-temperature thermal structural components, and coating technology is an effective means to solve the problem of high-temperature easy oxidation of this material. MoSi 2 It has high temperature stability in an oxidizing atmosphere at 1800°C, can be continuously used in air at 1650°C for more than 2,000 hours, and has excellent self-healing pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 李贺军李婷史小红
Owner NORTHWESTERN POLYTECHNICAL UNIV